MAX853C/D [MAXIM]
Low-Noise, Regulated, Negative Charge-Pump Power Supplies for GaAsFET Bias; 低噪声，稳压型，负电荷泵电源的GaAsFET偏置
| 型号： | MAX853C/D |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Noise, Regulated, Negative Charge-Pump Power Supplies for GaAsFET Bias |
| 文件： | 总8页 (文件大小：120K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0238; Rev 2; 4/96
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
0–MAX853
_______________Ge n e ra l De s c rip t io n
The MAX850–MAX853 low-noise, inverting, charge-
pump power supplies are ideal for biasing GaAsFETs in
cellular telephone transmitter amplifiers.
____________________________Fe a t u re s
♦ Fixed -4.1V or Adjustable -0.5V to -9V Output at 5mA
♦ 4.5V to 10V Input Voltage Range
♦ 2mVp-p Output Voltage Ripple (MAX850–MAX852)
1mVp-p Output Voltage Ripple (MAX853)
The MAX850–MAX852 offer both preset (-4.1V) and
a d jus ta b le (-0.5V to -9.0V) outp ut volta g e s . The
MAX853 uses an external positive control voltage to set
the negative output voltage. Input voltage range for all
four devices is 4.5V to 10V. Output current is 5mA.
♦ 100kHz Charge-Pump Switching Frequency
(MAX850/MAX851/MAX853)
♦ External Synchronizing Clock Input (MAX852)
An internal linear regulator reduces the output voltage
ripple to 2mVp-p. With a well-filtered control voltage
♦ Logic-Level Shutdown Mode: 1µA Max Over
Temperature (MAX850/MAX852/MAX853)
(V
), the MAX853 achieves typical output ripple of
CTRL
♦ Low Cost, 8-Pin SO Package
less than 1mVp-p. Supply current is 3mA max, and
shutdown current is less than 1µA max over temperature
(5µA max for MAX851).
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
Dice*
8 SO
MAX850C/D
MAX850ISA
MAX850ESA
MAX851C/D
MAX851ISA
MAX851ESA
MAX852C/D
MAX852ISA
MAX852ESA
MAX853C/D
MAX853ISA
MAX853ESA
________________________Ap p lic a t io n s
Cellular Phones
-25°C to +85°C
-40°C to +850°C
0°C to +70°C
8 SO
Negative Regulated Power Supplies
Personal Communicators, PDAs
Wireless Data Loggers
Dice*
8 SO
-25°C to +85°C
-40°C to +85°C
0°C to +70°C
8 SO
Dice*
8 SO
Continuously Adjustable GaAsFET Bias
LCD-Bias Contrast Control
-25°C to +85°C
-40°C to +85°C
0°C to +70°C
8 SO
Dice*
8 SO
8 SO
-25°C to +85°C
-40°C to +85°C
__________Typ ic a l Op e ra t in g Circ u it
°
* Dice are specified at T = +25 C only.
A
V
IN
= 4.5V to 10.0V
(4 CELLS)
C3
__________________P in Co n fig u ra t io n
IN
C1+
C1-
V
= -4.1V
OUT
TOP VIEW
C1
C2
(V of GaAsFET)
GG
MAX850
MAX851
MAX852
OUT
C4
C1+
C1-
IN
1
2
3
4
8
7
6
5
NEGOUT
GND
OUT
MAX850
MAX851
MAX852
MAX853
NEGOUT
SHDN*
SHDN
OSC
FB
FB**
SHDN*
(MAX850–852)
(MAX850/853)
GND
SO
* MAX850: SHDN
MAX851: SHDN
MAX852: OSC
* SHDN (MAX851)
OSC (MAX852)
** CONT (MAX853)
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V to GND ..................................-0.3V to 10.5V
Operating Temperature Ranges
IN
V
to GND...................................................-10.5V to 0.3V
MAX85_ISA......................................................-25°C to +85°C
MAX85_ESA.....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
NEGOUT
V
V
.........................................................-0.3V to 21V
IN to NEGOUT
VOUT to GND (Note 1) ........................................V
SHDN or OSC (pin 4) Voltage to GND.........-0.3V to (V + 0.3V)
to 0.3V
NEGOUT
IN
Continuous Power Dissipation (T = +70°C)
A
SO (derate 5.88mW/°C above +70°C) ........................471mW
Note 1: The output may be shorted to NEGOUT or GND if the package power dissipation is not exceeded. Typical short-circuit
current to GND is 50mA.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(+5V ≤ V ≤ +10V, GND = 0V, V
= -4.1V, R = ∞, T = T
to T , unless otherwise noted. A 100kHz, 50% duty cycle square
MAX
IN
OUT
L
A
MIN
0–MAX853
wave between GND and V is applied to OSC on the MAX852.)
IN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range (Note 2)
V
IN
5
10
V
MAX850–MAX852, V = 0V,
FB
-4.3
-4.2
-4.1
-3.9
-4.0
R
= ∞ or 820Ω, Figure 2a
L
Output Voltage
V
OUT
V
MAX853, V
= 4.1V,
CTRL
R
= ∞ or 820Ω, Figure 2c
L
Output Voltage Range
Set Voltage
-0.5 to -(V - 1)
V
V
IN
V
MAX850–MAX852, no load, Figure 2b
-1.32
-1.28
2.0
-1.24
FBset
Supply Current
I
Q
3.0
1
mA
MAX850/MAX853, V = 10V, SHDN = 0V
IN
0.002
2
Shutdown Supply Current
I
MAX851, SHDN = 2V
MAX852, OSC low
5
µA
SHUT
1
MAX850–MAX852, V = 0V,
FB
4
3
8
8
R
= ∞ or 820Ω, Figure 2a
L
V
Load Regulation
Ripple
mV/mA
mVp-p
OUT
MAX853, V
= 4.1V,
CTRL
R
= ∞ or 820Ω, Figure 2c
L
MAX850–MAX852
MAX853
2
1
V
OUT
Oscillator Frequency (Note 3)
Input High Voltage
Input Low Voltage
Input Current
f
MAX850/MAX851/MAX853, T = +25°C
A
80
100
120
kHz
V
OSC
V
Pin 4
Pin 4
Pin 4
Pin 4
2.0
IH
V
IL
0.5
±1
V
I
IN
µA
pF
Input Capacitance
C
10
IN
Note 2: The supply voltage can drop to 4.5V, but the output may no longer sink 5mA at -4.1V.
Note 3: The MAX852 will operate with a 50kHz to 250kHz square wave of 40% to 60% duty cycle. For best performance, use an
80kHz to 120kHz square wave with 50% duty cycle.
2
_____________________________________________________________________________________
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
0–MAX853
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(Circuit of Figure 2a, V = 6V, T = +25°C, unless otherwise noted.)
IN
A
OUTPUT VOLTAGE vs.
INPUT VOLTAGE OVER TEMPERATURE
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
60
50
-4.13
-4.12
-4.11
-4.10
-4.16
-4.15
I
= 2.5mA
OUT
T
= +25°C
A
-4.14
-4.13
-4.12
40
30
20
10
T
A
= -40°C
-4.09
-4.08
-4.07
-4.06
T
= +85°C
A
-4.11
-4.10
6.0
7.0
8.0
9.0
10.0
5.0
2.0
4.0
6.0
8.0
10.0
0
5.0
6.0
7.0
8.0
9.0
10.0
INPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
SUPPLY CURRENT
vs. TEMPERATURE
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
START-UP TIME vs.
INPUT VOLTAGE
2.00
1.80
1.60
2.00
1.80
1.60
1.40
2.5
2.4
I
= 5mA
V
IN
= 10.0V
OUT
2.3
2.2
1.40
1.20
1.00
0.80
0.60
2.1
2.0
1.9
1.20
1.00
1.8
1.7
1.6
0.80
0.60
0.40
0.20
-40 -20
0
20
40
60
80 100
5.0
6.0
7.0
8.0
9.0
5.0
6.0
7.0
8.0
9.0
10.0
10.0
TEMPERATURE (°C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
EFFICIENCY vs. LOAD CURRENT
= 5.0V
80
70
V
IN
V
IN
= 6.0V
60
50
40
30
V
IN
= 10.0V
20
10
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
LOAD CURRENT (mA)
_______________________________________________________________________________________
3
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 2a, V = 6V, T = +25°C, unless otherwise noted.)
IN
A
MAX850–MAX852
MAX853
OUTPUT NOISE AND RIPPLE
OUTPUT NOISE AND RIPPLE
V
OUT
V
OUT
500µV/div
500µV/div
0–MAX853
10µs/div
10µs/div
V
IN
= 6.0V, V = -4.1V, I = 5mA, AC COUPLED
V = 6.0V, V = -4.1V, I = 5mA, AC COUPLED
IN OUT OUT
OUT
OUT
MAX853
NOISE SPECTRUM
MAX850–MAX852
NOISE SPECTRUM
70
70
60
50
40
30
60
50
40
30
20
10
20
10
0
0
-10
-10
-20
-30
-20
-30
0.1
1.0
10
100
1000
0.1
1.0
10
100
1000
FREQUENCY (kHz)
FREQUENCY (kHz)
NOTE: dBµV = 20 log V
OUT
1µV
4
______________________________________________________________________________________
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
0–MAX853
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 2a, V = 6V, T = +25°C, unless otherwise noted.)
IN
A
MAX850/MAX851/MAX853
START-UP FROM SHUTDOWN
MAX852
START-UP FROM SHUTDOWN
V
OUT
2V/div
V
OUT
2V/div
V
5V/div
OSC
V
5V/div
SHDN
200µs/div
200µs/div
CIRCUIT OF FIGURE 2a, V = 6.0V, V = -4.1V, I = 5mA
CIRCUIT OF FIGURE 2a, V = 6.0V, V = -4.1V, I = 5mA
IN OUT OUT
IN
OUT
OUT
SHUTDOWN OCCURS WHEN 100kHz EXTERNAL CLOCK IS GATED OFF
LINE-TRANSIENT RESPONSE
LOAD-TRANSIENT RESPONSE
0.01mA
5mA
I
OUT
V
OUT
20mV/div
V
OUT
6.0V
5.5V
V
IN
50mV/div
2ms/div
1ms/div
= -4.0V, AC COUPLED
V
OUT
= -4.08V, I = 5mA, AC COUPLED
OUT
V
OUT
_______________________________________________________________________________________
5
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
MAX850 MAX851 MAX852 MAX853
1
2
3
4
–
–
1
2
3
–
4
–
1
2
3
–
–
4
1
2
3
4
–
–
C1+
C1-
Positive terminal for C1
Negative terminal for C1
NEGOUT Negative Output Voltage (unregulated), V
= V + 0.2V
IN
NEGOUT
SHDN
SHDN
OSC
Active-low TTL logic level Shutdown Input
Active-high TTL logic level Shutdown Input
External Clock Input
Dual-Mode Feedback Input. When FB is grounded, the output is preset to
-4.1V. To select other output voltages, connect FB to an external resistor
divider. See Figure 2b.
5
5
5
–
FB
Control Voltage Input. To set V
OUT and a positive control voltage between 0V and 10V. See Figure 2c.
, connect a resistor divider between
OUT
–
–
–
5
CONT
0–MAX853
6
7
8
6
7
8
6
7
8
6
7
8
OUT
GND
IN
Output Voltage
Ground
Positive Power-Supply Input (4.5V to 10V)
ear regulator, and appears at OUT (Figure 1). The mini-
_______________De t a ile d De s c rip t io n
mum (most negative) output voltage (V ) achievable
OUT
The MAX850–MAX853 are low-noise, inverting, regulat-
ed charge-pump power supplies designed for biasing
GaAsFET devices, such as power-amplifier modules in
cellular handsets.
is the inverted positive voltage, plus the 1.0V required
by the post-regulator. The ripple noise induced by the
charge-pump inverter is reduced by the linear regulator
to 2mVp-p at V
for the MAX850–MAX852. In addi-
OUT
The applied input voltage (V ) is first inverted to a
IN
negative voltage at NEGOUT by a capacitive charge
pump. This voltage is then regulated by an internal lin-
tion, the excellent AC rejection of the linear regulator
attenuates noise on the incoming supply. Up to 5mA is
available at OUT.
C1+
C1-
IN
CHARGE
PUMP
C1+
C1-
IN
CHARGE
PUMP
MAX850
MAX851
MAX852
NEGOUT
OUT
FB
MAX853
N
NEGOUT
OUT
N
SHDN (MAX850)
SHDN (MAX851)
OSC (MAX852)
CONNECT TO
GND TO SET
= -4.1V
SHDN
V
OUT
-1.28V
REF
CONT
CONTROL
VOLTAGE
GND
GND
Figure 1b. MAX853 Block Diagram
______________________________________________________________________________________
Figure 1a. MAX850–MAX852 Block Diagram
6
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
0–MAX853
__________Ap p lic a t io n s In fo rm a t io n
V
IN
S e t t in g t h e Ou t p u t Vo lt a g e
For the MAX850–MAX852, select either a fixed or an
adjustable output voltage. Connect FB directly to GND to
select the fixed -4.1V output (Figure 2a). To select an alter-
nate output voltage, connect FB to the midpoint of a resis-
C3
1µF
IN
C1+
C1-
C1
1µF
V
OUT
= -0.5V to -9V @ 5mA
OUT
MAX853
C4
10µF
tor voltage divider from OUT to GND (Figure 2b). V must
IN
NEGOUT
R2
100k
C2
1µF
be 1.0V above the absolute value of V
to allow proper
OUT
regulation. The output voltage is calculated from the formu-
la below. Choose R2 to be between 100kΩ to 400kΩ.
SHDN
CONT
R1
100k
R2
GND
V
= -1.28 1+
(
)
OUT
R1
V
CTRL
(0V TO 10V)
V
IN
Figure 2c. MAX853 Standard Application Circuit
C3
1µF
For the MAX853, set the output voltage, VOUT, by con-
necting a resistor voltage divider between OUT and a
IN
C1+
C1
V
= -4.1V
OUT
positive control voltage, V
(Figure 2c.)
CTRL
1µF
(V of GaAsFET)
GG
MAX850
MAX851
MAX852
C1-
OUT
FB
C4
10µF
R2
V
= - V
CTRL
OUT
NEGOUT
R1
C2
1µF
Shutdow n
The MAX850–MAX853 feature a shutdown mode that
reduces the supply current to 1µA max over temperature
(5µA max for the MAX851). The MAX850 and MAX853 have
an active-low TTL logic level SHDN input, whereas the
MAX851 has an active-high SHDN input. To shut down the
MAX852, set the OCSC input to a logic-low level. The device
is powered up by the resumption of the clock signal.
SHDN*
SHDN
OSC
GND
*MAX850: SHDN
MAX851: SHDN
MAX852: OSC
Figure 2a. MAX850/MAX851/MAX852 Standard Application Circuit
Ca p a c it o rs
Use capacitors with low effective series resistance (ESR) to
V
IN
maintain a low dropout voltage (V - V
). The overall
IN | OUT|
C3
dropout voltage is a function of the charge pump’s output
resistance and the voltage drop across the linear regulator
(N-channel pass transistor). At the 100kHz switching fre-
quency, the charge-pump output resistance is a function of
C1 and C2’s ESR. Therefore, minimizing the ESR of the
charge-pump capacitors minimizes the dropout voltage.
1µF, 0.8Ω ESR capacitors are recommended for C1, C2,
and C3. C4 should be 10µF, 0.2Ω ESR. All capacitors
should be either surface-mount chip tantalum or chip
ceramic types. External capacitor values may be adjusted to
optimize size and cost.
IN
1µF
C1+
C1-
C1
1µF
R2
R1
V
OUT
= (-1.28V) 1+
(
)
MAX850
MAX851
MAX852
OUT
FB
C4
10µF
NEGOUT
R2
100k
C2
1µF
SHDN*
SHDN
OSC
R1
100k
GND
S w it c h in g -Fre q u e n c y Co n t ro l
Use the MAX852 to minimize system interference caused by
conflicting clock frequencies. An external oscillator can set
the charge-pump frequency and reduce clock frequency
*MAX850: SHDN
MAX851: SHDN
MAX852: OSC
Figure 2b. MAX850/MAX851/MAX852 Adjustable Configuration
_______________________________________________________________________________________
7
Lo w -No is e , Re g u la t e d , Ne g a t ive
Ch a rg e -P u m p P o w e r S u p p lie s fo r Ga As FET Bia s
sensitivity and interference. The clock must be a square wave
between 40% and 60% duty cycle. The maximum clock fre-
quency is 250kHz, and the minimum frequency is 50kHz.
___________________Ch ip To p o g ra p h y
IN
C1+
La yo u t a n d Gro u n d in g
Good layout is important, primarily for good noise perfor-
mance.
1) Mount all components as close together as possible.
C1-
GND
OUT
2) Keep traces short to minimize parasitic inductance
and capacitance. This includes connections to FB.
0. 127"
(3. 226mm)
NEGOUT
3) Use a ground plane.
No is e a n d Rip p le Me a s u re m e n t
Accurately measuring the output noise and ripple is a chal-
lenge. Brief differences in ground potential between the
MAX850–MAX853 circuit and the oscilloscope (which result
from the charge pump’s switching action) cause ground
currents in the probe’s wires, inducing sharp voltage spikes.
For best results, measure directly across the output capaci-
tor (C4). Do not use the ground lead of the oscilloscope
probe; instead, remove the probe’s tip cover and touch the
ground ring on the probe directly to C4’s ground terminal.
You can also use a Tektronix chassis mount test jack (part
no. 131-0258) to connect your scope probe directly. This
direct connection gives the most accurate noise and rip-
ple measurement.
FB (MAX850–852)
CONT (MAX853)
0–MAX853
SHDN (MAX850/853)
SHDN (MAX851)
OSC (MAX852)
0. 085"
(2. 159mm)
TRANSISTOR COUNT: 164
SUBSTRATE CONNECTED TO IN
________________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
MIN
0.053
MAX
0.069
0.010
0.019
0.010
0.197
0.157
MIN
1.35
0.10
0.35
0.19
4.80
3.80
MAX
1.75
0.25
0.49
0.25
5.00
4.00
A
A1 0.004
B
C
D
E
e
0.014
0.007
0.189
0.150
E
H
0.050 BSC
1.27 BSC
H
h
0.228
0.010
0.016
0˚
0.244
0.020
0.050
8˚
5.80
0.25
0.40
0˚
6.20
0.50
1.27
L
α
8˚
21-325A
h x 45˚
D
α
A
0.127mm
0.004in.
8-PIN PLASTIC
SMALL-OUTLINE
PACKAGE
e
A1
C
L
B
8
______________________________________________________________________________________
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